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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f79a9c4e5edf2f6b129954355588df3e27af0622d5322f08c7524ed669c30452' 
  AND token = 'Dyg0Zr+WnKxSdDE9VcXWgaISBP4tsm1l5Qkd/V4BN8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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