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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9787647b45ffec33308a963ab92cf591d2adacc3fbd02c8861e59d2e9446d272' 
  AND token = 'frd5f9KDJBN0RiZDaFO+k1ZaCP6rToGXyeO+/edicIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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