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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14658f465bba872cf26954a8c0f0d32c000da2c973f2c161fa8c98923b6e0a90' 
  AND token = 'RJlY3J+LS/Kfps/OC1HmBz/8rCpmk8RYH2fCukb/yNw=' 
  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"
    }
  }
}