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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e863fa026195ecd942e10149d5291f1046a401f5e8a61c5d8d80cc54d733f595' 
  AND token = '0sikJkqEMA+C9wzgFUoD3P6Q0+sclYDpNPJ6MXtrBFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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