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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c445a6640a935e1d593f96bcdae481b79c12e38aaa9927cd5428e06b0fe20c' 
  AND token = 'tsWn2weBlddicrydeAczfx+7cuHHafrO7Ttcg09WcmM=' 
  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"
    }
  }
}