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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f18a3fb12bb8bad2654d53f6d815f5e8095840b0cf6feb972c14a7e0e84e7c28' 
  AND token = '1g8u/15PwuKbJcBy0X9lKgVLRjpXS1F3aXBDn/d8hR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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