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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88140b4d55632e1adabce66a02c14ad761077f6c1dbcda2687d06d9881dd97d' 
  AND token = '16d1l2wIet96mn5eXVkT4rbmKQfrtS8NfY5vx0i00U0=' 
  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"
    }
  }
}