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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e0b307f2fabc7c48e478ad52e3c86c79609d22fc0521275090f49af7a482c2f' 
  AND token = 'Fn+7CI6V0AV+JAzfUDpUdDymaFoQnqNcLjW0TMFBrOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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