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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83626cb8220068ace83fdc75a198b91644d30a44e4921b4b03c87349f5fe64c' 
  AND token = 'JNQ2192RWxHKImIilEmZQAmY1tXnN8UgxWLdhyl1qM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00131

JSON explain

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