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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d39ecf6e57ef18178ed6fe8eb60efdf42d665dfa595c64aeba8d535e3e441fa' 
  AND token = 'Yq8czOzqFR5/u/S1sRuZx+/pCDDGxD6RJC27PZ23Qxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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