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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338b77ea8caf37671cb5d182671a51e45493478a31f4073119950d7a5d8752b3' 
  AND token = 'gMO4U7r7vZmVt/rDxJkCI6FDkJRMpF24spI130S9hfI=' 
  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"
    }
  }
}