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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e64784a10a1e325235d7ebe6e29bbeff5c86204a078d9f9e6dcae24608f7cf9' 
  AND token = 'A8S55VWZYeeQOQvAMc4mAxnvM2GFZOhhocR8A210flc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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