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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67af3ae5aa7d0c6bc890f8373d33c4c6075b73af11f29adab4155810bfb997e8' 
  AND token = '3t2RSlNzs6zY+amjNKispC1yfIX78IFg2Mf6hTbGnOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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