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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baac9a84ce080931f77fd05b4b2777ebb7138d7662bc570bbb1afb2da3d8240d' 
  AND token = 'L4F/gIMlQ0mbV8Br3sxC0LwqDzo3UjAFKLIN9yEA6Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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