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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7307a52e846a062941b50270b75d7ef352818ff87ecc8cf397f510c2de29e8b0' 
  AND token = 'efxfhn5BoYKfJVU4kkmqAF+qhU0sMW3FKiKx/ncZcGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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