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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b66e80b602ffb71a4c037048c3c47c500a5df810de8e420dc7c31d83c80782e' 
  AND token = 'N3TT0lh97Yy2nJ/6jKXr8TcmVDdQT1yhbC2sxSxS6Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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