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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '211e57d5a03e4936f7031bb5763a285fe06d15023f5cf9a7fd2ad84ca3099f21' 
  AND token = 'bjh3jIB/4myMEUyLmrgpIsWTT18WInbs6iHYbLcP3YE=' 
  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"
    }
  }
}