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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd368d62218beccadd9fdd7df14f9688f28fc6e85af918ca394b1795f119e380d' 
  AND token = 'f0r0KqRYNvXGF+r9cmOQ34wFA4Dc2VHOvU9FHE7XCpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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