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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11b747808fc6b28c90d3199ea1f265c4c8c367ffea60672ec128661bfac6d958' 
  AND token = 'DFo+kQdL+LYDM/ZdMqmWRC0cOELnYvWyEIic4CDLIFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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