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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2787e22e9a86e5ac85e1c8f0cbde998762453b4b3468334e02db178e47850356' 
  AND token = '/Osty70gUAEIackJbgAzKSflEtMr3i7aElugJR4d+MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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