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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6385aaa26184e5f92da675df2171f12c0934e81ea0cc4436c1afd5f07975d3' 
  AND token = '/wGlFS7ZTPPgcyt+DD2XlObsMkR9IVQXLdV0Y2u6aEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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