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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69035cb7c5b8de917b23e9457ce933f6ef241aad85bbf08f239917a25ae0c6b' 
  AND token = '/TYFeTmRM38W2RD06QQ9JFJCB1BYCiGqvAvQ0vBXedQ=' 
  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"
    }
  }
}