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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c78f5f7165b838bf08ca74e3c5caa953df1b14210c8b6eb3274185d20662a2' 
  AND token = 'eGM0Vkit9dIfI/3KRXZS0bQqkklt/sbCwJH67oak5GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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