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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1cf8009ab63e33aae999bf9d2d7ecb224b46c1ee2fe39e9f913c5778639c62' 
  AND token = 'B3v2ScLp9vChml85QXHdZsCumBnQ8v/jCeV3RbUrek4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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