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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a37813176cad8149ca0820966895d0ce45ec2612736b14d592cdaab4a47a8a3' 
  AND token = 'LtW1+mEbiSBbHDbgtHFo8VJ0IajQ5dH5kpy6qG/h+AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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