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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6c8101fd7f627e395b2bb0b401fd0b811ffa7a455d61e7c04fb392594f1e20' 
  AND token = '44+1o9WxoKdR9SeLfS1LE05u+HL0XBu3h/4NZ0fg6gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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