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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf00c42100fc55b226cd71b8c182522fb490da6a0e06fd1430be5bb881344d1' 
  AND token = 'keKnlEIadF/2EfMgKM2mz0e+yM1mN54j7WAkLNzw/HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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