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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d29f9a39d046d93a1d7f6a44377643888775b822242221c7a905d7222927b29' 
  AND token = 'qdvOFsxtL2Ym/Xg1TVsVylvCn5IDmcXitl9QUmfTpUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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