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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f5560ca7e53b636e2b5fba33097d25bc31768725de19d65db1a38b2e278b046' 
  AND token = 'YHYE8M/eGgxW+wQoMdU+3IdsQHb70mL0VnCTUWI1dgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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