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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1859e6ed97620252203762a29b95aebbefb1b5c16163ca0ff4dd710918b647ed' 
  AND token = 'dhs8MBhQANXKrtZ5eLL7vf/1xSVP3bliLWQbxLbw4Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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