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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a880737ee983b9020cc8d87482225eb59c6efd29c94c4a0639308988c70cd0b' 
  AND token = 'pVy6i3z8VRLeylfmwHeIdMQqvqENjb/V+/1UHNZZZ1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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