SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9914bf2a0fd8840770d703567c58d5d00e44c4f5e25de8788af7965ecb065677' 
  AND token = 'jrvqBfM4we9nXh+A+L/+sNvJEQ7YoKYgpXtB+6kmK/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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