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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793a41a67f8505c310a7725e36f41b038ad158d7dfedd4ef3eec486eb5b4c555' 
  AND token = 'v4kNgVWMd4tkMkxCO5VaC68sknwv00ry01aYvWdIXVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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