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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c50dfcbdfa69c25f5e9874d755f2aa62bcdbf948eae19e794630f22469cd70b' 
  AND token = 'pUJNcm1p0cZb0K7ucJbkF/pHPetlugWQp/JMf8ilmMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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