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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9fc2a8cb8cc691e86d30625fcb1815101b7629516a7054b8c12e19c32a4c0dc' 
  AND token = '3mpgSmQQrbxnZZO9Ho+4hkqL3pRCOpnjSIbg2Rjn3fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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