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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7d18ff06bc77d125ff2c1e9bab04385e3d92e9b881013380286c22c68ba4fde' 
  AND token = 'kWDVlLaOF3+DthuYryRN8fgfZWEg8A8WtClWi9vLfg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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