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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7e290cc5fd7318a79ec6fcde3ac0eecf57209ee8cb9f30beb2305142e2b874' 
  AND token = 'zw6E2ECd3FS/BxN1omc540orXwjXiVgQKZiBU5fmYHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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