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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532144ba9972cae3a7a6ebc99a6f3a8198c4188730d9d0afbc6695f4d1e562a2' 
  AND token = 'plnwUPgxMvtCMtVUtO/spynFHRdrQ6uVMPDGu/I2iH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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