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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85bcab201796258cb99fcbc631f202c62e5b1c011e8f69ea9c02c532b1dad933' 
  AND token = 'vQ7olP1f6BYBETcTL0EYUy66UA/701+jafbmTYVpZCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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