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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'befe7a2d7f2c55a0602d79a9367120dd6e445ff5a50860a3b204f60c91b0ff2c' 
  AND token = 'MnMU7Ykoa1mk1UlVLBo7Jq2qQZuJFeD05C/qaprhYus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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