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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce962e8052ad9a43452f37c6a875b6f249e73af221522ffad353f557f19f3ee' 
  AND token = 'WKYgNH2esVGaP8wjpuMHAgK6HIjA/5U0Ym7Xc+R6KpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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