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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd13a6d2ff5af0a0d2a75b3360b0cdbc1819356481053266b1ddd0f54c0d8c95' 
  AND token = '+QtdrUAQgh75kpzDitSPxGOGKbIkR6ZRwK+PYbm3dQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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