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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3bea86c8203335ffb07f9093a840795189ad54d7f14f44ecd1c2ca3ecd04582' 
  AND token = 'RdQzahN72V2LELjdk4ddHHecau5UfpMR+JYZLW9+xbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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