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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90b1f474d3cbc1564772bb4c34d190e82883142e28af6edb3003019da6bf3f6' 
  AND token = '63p04iWQH/SuFlX76F65IrrS7sqywdN0fko8MTiR8uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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