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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa87656626568b056cf84f4d67e4058019cd239504be429a35e76b4a2d64c30' 
  AND token = 'y4ZrRC3D60xppprBCukpHDjhtIVrcF7+u0R054C+68s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}