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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2171a36f41a99a21754c8814e3c7789a52c0de7a76122ad50e4a715dd82988c5' 
  AND token = 'iN1sGxPRO+XZ3dhoIgty7yJ8Hh4IZAuNAfqD4QrzTJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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