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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f0b183a41505cf0471c3452bff2725a30eb1c372b5279f4c4062d4c284ef85' 
  AND token = 'y3AFb6TVv51ImylJnewVFO0RG8q1Rdk2ADPtXtHWv5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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