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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e72359785d5b2d2beb91e06d887c87963a1a585f258f4eb8ecb40aca9b9095' 
  AND token = 'YLgSH5/gKHUpet1eoICZPk+F4U/EBIp+1X7SJfz21dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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