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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f53bc28f922f783061aa85579fce8980d2dbb5c2e3f0889613b98ff2448558ef' 
  AND token = 'u/3TIyUBOiAqOmUxt+llhe4arI8AOYTA0Ghq6dZ9sVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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